
<h2 id="toc_0.1">Horizontal line</h2>
<hr />
<hr />
<hr />
<h2 id="toc_0.2">???</h2>
<p>
whitespace before or after (?)
----  
 ----
</p>
<h2 id="toc_0.3">Non-matches</h2>
<p>
---
a----
----a
</p>

